Manufacture of reinforced-concrete beams.



A; GHIRA. MANUFACTURE OF REINFORGED CONCRETE BEAMS.

APPLIOATION I'ILED JUNE 26, 1911.

Patented Nov.28, 1911.

ANDREAGI-IIBA, or 'rnrns'r, AUSTRIA-HUNGARY.

MANUFACTURE OF REINFORCED-CONCRETE BEAMS.

Specification of Letters Patent.

Patented Nov. 28, 1911'.

Application filed June 26, 1911. Serial No. 635,472.

This invention relates to the manufacture.

of reinforced concrete beams and has for its object an improved apparatus for the same by means of which the channel in which the beam is molded may be easily removed after the beam has hardened.

The invention consists in an improved apparatus for the manufacture of reinforced concrete beams in which the mold channel is constituted by a self-supporting girder, preferably of sheet iron, having at the ends a lateral supporting arm on each side, which arms find their abutments in niches in the supporting wall at both sides of the abutment of the beam.

In. order that the self-supporting mold channel may be adjusted to different lengths it is made in three parts of-which the two end parts overlap the center part whereby the three can be connected into a rigid system; each part of the channel mold is also divided longitudinally through the center of the beam, and these parts are held in position to constitute a closed channel mold during the casting of the beam, by means of suit-able clamping devices, the halves of the mold being separated when the-casting op eration is finished, by removing the clamping devices.

The invention is illustrated by way of example in the accompanying drawings, in which:

Figure 1 illustrates the channel mold in the position it assumes during the manufacture of the beam. Figs. 2, 3 and 4 are sections on a larger scale through A B, C D, E F of Fig. 1 and Fig. 5 is a section through Gr H of Fig. 3.

The self-supporting channel mold has its ends supported in niches z a in the supporting wall at the side of the abutments u of the beam.

In the manufacture of the beam, the abutment spaces at for the reception of the ends of the concrete beam, are formed as the work goes on, and left and right above these spaces the small niches a 2 are left for the reception of the supporting arms w w of the mold. The mold is made in three lengths I, II, III of which the two end sections II and III can be adjusted telescopically with the middle section I so that any suitable lengths of beam can be cast. The rigid connection of the central length I with the end lengths II and III is effected by the fitting of the ends of. the end lengths into the ends of the middle length as shown in Fig. 4, the joints being secured at the top edges by means of suitable clamps a). Each length of the mold is divided longitudinally through the center of the beam into members 79, g, which are retained in their correct relative positions during the casting of the concrete beam by means of suitable clamping devices.

In the example illustrated a number of arms m n are attached to each section in such a manner that the arms m attached to one half abut closely with the arms n of the other half when the mold is built up; the correct relative position of the arms m n is insured by means of pins 70, as is customary with molds in two parts, which pins engage in corresponding holes in the other arm. To the arms attached to one section of each mold length are connected plates h which overlap at the sides the adjacent arms when the mold is built up, in which plates are holes 0 in which are mounted the spindles of eccentrics 25, each provided with a handle a. By suitable rotation of cranks a the lower portions of the arms 1% n are pressed against each other and the halves of the mold lengths I, II, III connected to each other in an easily removable manner. The mold lengths are given suitable beadings or swellings r at the lower part of their cross section, in order to provide the beam with lower boom projections, and these beadings assist in making the connection of the mold sections more secure.

The channel molds are used in the man- 'ner hereinbefore described; when the construction has gone on so far that the manufacture of the beam is to take place, the

supporting arms w of the mold are inserted and removed from the plates h for which purpose the openings 0 in the said plates are made sufficiently large.

Owing to the arrangement that the abutments of the mold are located above and on both sides of the beam an exceptionally stiff mounting of the molds is obtained and also the effect that the mold halves, after the uncoupling of their connections, have a natural tendency to separate and detach themselves.

Having now particularly described my said invention and in what manner the same is to be operated, what I claim is:

A mold for casting concrete beams formed of telescopically adjustable sections which are divided longitudinally into two corresponding members, supporting extensions at the ends of the terminal members to engage recesses in the abutting wall, clamps on the upper edges of the lapping portions of said sections, arms outwardly secured to said sections and having extensions below the mold, perforated plates on one of said extensions, reaching beyond the other extension and a lever actuated spindle carrying an eccentric in said perforations for the purpose specified.

In testimony whereof I hereunto my signature in presence of two witnesses.

, ANDREA GHIRA.

Witnesses ADoLF CRIsMAN, F RAUMIE FROZLIE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

